Examples
In a study that compared an electrostatic precipitator with a fabric filter, LCI results according to Table 15.3 were obtained. The dust-cleaning capacity of the FF was higher than for the ESP, but the energy used for operating the FF was higher, leading to increased C02 emissions and depletion of fossil resources. The question then becomes, which method is preferable?
Using the factors from Table 15.2, all the methods recommend the electrostatic precipitator (Table 15.4). The priorities obtained by different methods do not always agree. The EPS method is more sensitive to resource depletion than the other methods.
The weighting methods are not used by many LCA practitioners today and the ISO standard specifically says that weighting must not be used for
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TABLE 15.3 LCI Results from Comparison of an Electrostatic Precipitator and a Fabric Filter
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Results
|
Ecoscarcity—CH |
39 000 |
53 500 |
|
Ecoscarcity—S |
11 200 |
15 200 |
|
Erw. themes, short-tetm, S |
5 630 |
7 630 |
|
Env. themes, long-term, S |
11 400 |
15 100 |
|
EPS |
21.7 |
26. |
|
Telius |
13.2 |
18. |
Comparative assertions (claims of overall superiority) disclosed to the public. It is, however, preferred by designers in companies for internal use. For optimization purposes, it is necessary to determine some weighting criteria.
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